I can verify that Alembic does indeed shape their instruments by hand - I've seen their employees doing it in person. They make their own sanding blocks, for example, which are designed to fit the hand of the craftsman using it. They also are built like accordions - they fit the contours of the instrument being carved/sanded.
When they say handmade, sure, it's not one hundred percent handmade in the sense that they use machines to do certain things (e.g., the CNC machine, a fretboard cutting machine, etc.). However, they are carved and sanded by hand, and they are finished, fretted, and set up by hand. Their electronics are handmade (with the exception of the pickups which are wound using a machine designed and built by Ron Wickersham himself), and their preamps and superfilters handwired (I watched Mr. Stouffer doing this). Again, something I saw first hand, and a thing of beauty it was (and is).
Perfection, IMHO, cannot be attained. It can only be striven for. If you achieve perfection, you have nowhere to go but down. This being said, what makes an Alembic the finest instrument on the planet IMHO is the relentless pursuit of perfection. This is no different than the chef who pursues the perfect dish, or the plumber the perfect faucet installation, or the woodworker the perfect chair. It is a never ending quest for the best that one can possibly make something, and again, I witnessed this first hand during my visit to Santa Rosa.
Finally, I don't care if the tailpiece doesn't line up symmetrically. The tailpiece police aren't going to arrest me. The sound and playability police might if my bass sounds and plays like crap, and no Alembic I've owned before or since does. As far as I'm concerned, I'd rather have something play and sound good rather than have an unplayable and &%^tty sounding instrument, regardless of cost.
I currently own 6 Alembic basses, with number 7 on the way. They are, to me, the finest bass guitar I've played in the 30 years I've played the instrument, period. Nothing else comes close in terms of quality, craftsmanship, and excellence. I have many basses that I love for different reasons, but nothing can touch an Alembic IMHO.
My two cents,
Alan